National LGBTI Officer for The National Union of Students April Holcombe said the spirit of the movement is about utilising grass roots democracy, people power and taking to the streets to put pressure on the government and demonstrate the scale of community support for marriage equality.

"We have the numbers in parliament now to get on with the job and to put in a bill and to pass it," Holcombe said.

"We've had majority support of the population for the last nine years."

The large crowd gathered at the Sydney Town Hall to hear speeches from the likes of Labor Senator Jenny Mcallister, Greens MP Dr Mehreen Faruqi and Gay rights activist Peter Murphy.

"We have two propositions put before us: one is of course the Labor party's proposition and the proposition of all progressive people in the Australian parliament," said Senator Jenny Mcallister.

"That is, the parliament ought to vote on marriage equality. That it ought to do it's job."

Lucy Quaggin
Passionate advocates get behind the LGBTI community.

Greens MP Dr Mehreen Faruqi reminded the crowd that opponents of marriage equality have often said that you can't change the definition of marriage.

But on this day, in 2004, the Howard government did change the definition of marriage -- to be a union between a man and a woman.

"Now is the the time for federal parliamentarians from all parties to align with the overwhelming opinion of the Australian people that says this change needs to happen -- and it needs to happens now," Farqui said.